We discuss various details regarding the practical use of direct-detection acousto-optic delay lines, and develop a mathematical model for the input signal. An expression for the transient response was obtained and used to determine the acousto-optic delay line response to an boxcar input signal. This expression for the transient response was used to determine the cutoff frequency of the acousto-optic delay line and derive an equation for the impulse response to determine the acousto-optic transmission coefficient of the acoustooptic delay line as a function of frequency. The resulting equations are confirmed by numerical examples. The numerical results were in turn experimentally validated using the direct-detection acousto-optic delay line model developed in this paper. The theoretical and experimental results were compared using two criteria: the output response to a boxcar input signal and the cutoff frequency of the frequency response curve. The cutoff frequency was obtained using an oscillogram of the output pulse and the experimentally determined frequency response. A comparison of the theoretical and experimental results indicated that the time- and frequency-domain equations for the response curves have high potential for time-domain processing of broadband analog signals.
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Translated from Izmeritel’naya Tekhnika, No. 9, pp. 46–52, September, 2019.
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Hasanov, A.R., Hasanov, R.A., Ahmadov, R.A. et al. Time- and Frequency-Domain Characteristics of Direct-Detection Acousto-Optic Delay Lines. Meas Tech 62, 817–824 (2019). https://doi.org/10.1007/s11018-019-01700-3
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DOI: https://doi.org/10.1007/s11018-019-01700-3